为什么我无法访问 while 循环中的变量

Question

由于某种原因，我无法从while循环内部访问变量。我已经查看了有关此的其他帖子，但是我似乎仍然无法弄清楚。

听到我的代码：

package pandacare;
import java.util.Random;
public class PandaCare {
Random r = new Random();
int HWT;
int hunger = 0;
int fun = 0;
int thirst = 0;
int energy = 0;
int hygiene = 0;
int points = 0;
int coins = 1000;
int total = hunger + fun +thirst + energy + hygiene;
public void hungerWait(){
    int Low = 5;
    int High = 30;
    HWT = r.nextInt(High-Low) + Low;
    try {
        Thread.sleep(5000);
    }
    catch(InterruptedException ex) {
        Thread.currentThread().interrupt();
    }
    hunger --;
}
    while(hunger > 0){
       hungerWait();
    }
}

Answer 1

花点时间仔细看看你的代码...

public class PandaCare {
    //...
    public void hungerWait() {
        int Low = 5;
        int High = 30;
        HWT = r.nextInt(High - Low) + Low;
        try {
            Thread.sleep(5000);
        } catch (InterruptedException ex) {
            Thread.currentThread().interrupt();
        }
        hunger--;
    }
    // This won't work, it's not a valid statement...
    while(hunger > 0){
       hungerWait();
    }
}

while(hunger > 0)在任何方法之外。 代码只能在静态块/初始化或方法中执行...

您需要将循环包装在某种方法中...

对于(粗略的(示例...

public class PandaCare {
    //...
    public void hungerWait() {
        int Low = 5;
        int High = 30;
        HWT = r.nextInt(High - Low) + Low;
        try {
            Thread.sleep(5000);
        } catch (InterruptedException ex) {
            Thread.currentThread().interrupt();
        }
        hunger--;
    }
    public void waitTillNoHungry() {        
        while(hunger > 0){
           hungerWait();
        }        
    }
}